Stopper for a breast pump



FIG. 1 is an isometric view of a stopper for a breast pump in accordance with our new design;

FIG. 2 is another isometric view thereof;

FIG. 3 is a front view thereof;

FIG. 4 is a back view thereof;

FIG. 5 is a side view thereof;

FIG. 6 is a side view thereof, for the side opposite that of FIG. 4;

FIG. 7 is a top view thereof;

FIG. 8 is a bottom view thereof; and,

FIG. 9 is a perspective view in the context of a breast pump.

The broken lines shown in the drawings are only provided to illustrate the environment of the design, and form no part of the claimed design. 

CLAIM I claim the ornamental design for a stopper for a breast pump, as shown. 